Adjustable hair-dryer hoods



Sept. 30, 1969 M. M. HANDLER ET AL 3,469,323

- ADJUSTABLE HAIR-DRYER noons Filed June 21, 1968 3 Sheets-Sheet 1 WVENTORS Q MARTINMHANDLER JON GULFO y JEROME B.BONAT ,ATTORN S M.-M. HANDLER ET AL 3,469,328

ADJUSTABLE HAIR-DRYER HOODS Sept. 30, 1969 Filed June 21, 1968 3 Sheets-Sheet 2 1M TORS MARTIN M.HANDLER JON GULFO JEROME B. BONAT 1 $541 if Q AT TORN BY Ma Sept. 30, 1969 HANDLER ET AL 3,469,328

ADJUSTABLE HAIR -DRYER HOODS Filed June 21, 1968 3 Sheets-Shee t 5 INVENTORS MARTIN HANDLER JON GULFO BY JEROME B. BONAT 41, 4:, 7

mfoams United States Patent O U.S. Cl. 34-99 22 Claims ABSTRACT OF THE DISCLOSURE A hair-dryer hood which is adjustable within a given range of drying positions as well as between drying and non-drying positions. The hood has fixed and movable quadrispheroidal telescopable sections each provided with inner and outer interconnected walls defining between themselves in fully extended position of the movable section a hemispheroidal chamber toreceive a gaseous drying medium. These hood sections respectively terminate in cooperating open ends which overlap each other to provide communication between the quadrispheroidal chambers of the two sections. The inner and outer walls of the movable section are movable along the inner and outer walls of the fixed section between a fully extended position where the section walls overlap each other to a minimum extent and a retracted position where the section walls overlap each other to a maximum extent. The movable section, when in extended position, provides the hood with a configuration substantially surrounding a body of hair which is to be dried, while, when the movable section is in its fully retracted position, it provides the hood with a configuration giving free, substantially unobstructed movement of the body of hair to and from the hood.

BACKGROUND OF THE INVENTION The present invention relates to hair dryers.

More particularly, the present invention relates to hairdryer hoods.

Such a hood conventionally surrounds the body of hair which is to be dried during operation of the hair dryer. Because the patron whose hair is being dried.is seated beneath the hood with her head within the hood, it is diificult for her to move to and from the hood while the latter remains stationary. For this reason it is conventional to provide hair dryers with movable hoods which can be displaced vertically toward and away from the body of hair which is to be dried. However, even when such movable hoods are counterbalanced they can be moved only with considerable difliculty by the person whose hair is being dried, so that it is necessary with conventional hair dryers for a beauty parlor attendant to displace the hood between its drying and non-drying positions. Because such an attendant is not always readily available, a considerable drawback of such conventional structures resides in the fact that a person whose hair is being dried cannot always have the hood removed when desired and is often virtually trapped within the hood. While attempts have been made to solve this problem, none of them have been completely satisfactory. Even if the individual whose hair is being dried is provided with a switch to turn the dryer off, nevertheless there is suflicient residual heat remaining in the hair dryer to create considerable discomfort and undesirable excessive drying if the individual cannot move away from the dryer. Multipart hoods while enabling easier access to and withdrawal of the patrons head, have not been adjustable as to area heated, are insufliciently easy and simple to open and tend to pinch stray tendrils or tresses of hair where the junction between the parts overlies the patrons hair.

A further problem encountered in hair drying hoods is that the bodies of hair which are to be dried extend over different areas depending upon the particular hair style and the size of the body of hair. Conventional hoods will invariably heat a given predetermined area so that irrespective of the size of the body of hair and the hair style the same area will have the heated gaseous drying medium applied thereto. As a result not only is there discomfort because the drying medium is directed toward areas where hair may not be located, but also there is waste of energy and other ineificiencies.

SUMMARY OF THE INVENTION It is accordingly a primary object of the present invention to provide a hair dryer which will avoid the above drawbacks.

In particular, it is an object of the invention to provide a hair-dryer hood capable of being easily manipulated, by the individual whose hair is being dried, to achieve not only unobstructed movement to and from the hood but also adjustment of the hood with respect to the area which is to be dried.

Also, it is an object of the invention to provide a hood structure which will accomplish these results while at the same time being exceedingly simple in its construction and inexpensive to manufacture.

Also, it is an object of the invention to provide a hairdryer hood which will operate with great efficiency, particularly with respect to preventing the escape of the drying medium to areas other than that where the hair to be dried is situated.

Furthermore, it is an object of the invention to provide for a hood of the above type structures which will compensate for wear of the hood components and will maintain a desired frictional engagement between movable and fixed hood sections.

In accordance with the invention, the hood includes fixed and movable quadrispheroidal telescopable sections, each having inner and outer interconnected walls defining between themselves in extended position a quadrispheroidal chamber for receiving a gaseous drying medium, the inner walls being formed with apertures through which the drying medium can be forced out under a mild pressure. These chambers terminate in cooperating open ends which overlap each other to provide for communication between the chambers in all relative positions thereof, and a duct for supplying the gaseous drying medium is connected to the outer wall of one of the hood sections, preferably the fixed section, to communicate with the chamber thereof for supplying both chambers with the gaseous drying medium. The interconnected inner and outer walls of the movable section are respectively movable along the inner and outer interconnected walls of the fixed section between a fully extended position where the walls overlap each other to a minimum extent and a retracted position where the walls overlap each other to a maximum extent. When the movable section is in its extended position the hood is of hemispheroidal shape and substantially surrounds the body of hair which is to be dried while when the movable section is in its retracted position, free, unobstructed movement of the patrons head to and from the hood is assured because the hood then is of quadrispheroidal shape. The movable section can be partially retracted to a somewhat less than hemispheroidal shape for suitable adjustment to the brow line of patrons head of hair.

Other objects of the invention in part will be obvious and in part will be pointed out hereinafter.

BRIEF DESCRIPTION OF DRAWINGS The invention is illustrated by way of example in the accompanying drawings which form part of this application and in which:

FIG. 1 is a schematic perspective illustration of a dryer which is provided with a hood of the present invention;

FIG. 2 is a longitudinal sectional elevation taken along line 22 of FIG. 1 in the direction of the arrows and showing, at an enlarged scale as compared to FIG. 1, details of one embodiment of a hood of the invention;

FIG. 3 is a top plan view of the structure of FIG. 2 at a scale smaller than FIG. 2;

FIG. 4 is a transverse sectional elevation of the structure of FIG. 3 taken along line 4-4 of FIG. 3 in the direction of the arrows and showing the structure at a scale which is enlarged as compared to FIG. 3;

FIG. 5 is a transverse partly sectional elevation of the hood of the invention as seen when looking from the rear thereof, the supply duct for the drying medium being shown in section in FIG. 5; and

FIG. 6 is a longitudinal partly sectional elevation, taken in a plane corresponding to that of FIG. 2, but showing another embodiment of a hood of the invention.

DESCRIPTION OF PREFERRED EMBODIMENTS Referring now to the drawings, FIG. 1 shows a hair dryer 10 which includes a cabinet 12 supported on suitable roller assemblies 14, so that the entire hair dryer can be easily transported to a location behind a patrons chair. Within the cabinet 12 there are such well-known elements as a blower which draws air in from the ambient atmosphere through a suitable filter, for example. The air is heated by suitable electrical heating elements, an unillustrated line electric cord being connected by a suitable plug to an unillustrated electric wall outlet to provide the electrical energy for activating the motordriven blower as well as for energizing the air-heating elements. A suitable control panel 16 is situated at the top of the cabinet 12, and with this known structure a suitable drying medium, which in this case is air at an elevated temperature, is directed upwardly through a duct 18 to a hood 20 of the present invention.

The hood 20 of the invention includes a fixed hood section 22 and a movable hood section 24. The fixed hood section 22 is directly connected to and carried by the duct 18, while the movable hood section 24 is carried by and movable with respect to the fixed section 22, so that the entire hood 20 is in fact carried by the duct 18. The duct 18 and the hood 20 are made of suitable, substantially rigid but springy synthetic plastics, such as polystyrene, polyvinylchloride, or the like, capable of being easily fabricated and capable of easily withstanding the mildly elevated temperature of the gaseous hairdrying medium without deformation.

The hood sections 22 and 24 each have substantially the configuration of a quarter of a sphere, actually in the hood 20 being described slightly more. The hood section 22 has an inner wall 26 (See FIGS. 2 and 4) and an imperforate outer wall 28, and the inner wall 26 is formed with a multitude of small apertures 30. The walls 26 and 28 define between themselves a quadrispheroidal chamber 32 for the mildly heated gaseous hair-drying medium. The bottom and distal end edges of the inner wall 26 terminate in an outwardly directed semi-circular flange 34 connected with a correspondingly positioned inwardly directed flange 36 of the outer wall 28 as by being welded thereto through ultrasonic welding, for eX- ample. Thus, the chamber 32 is closed at the bottom and p 4 distal end of the fixed hood section 22 by the semicircular end Wall composed of the cooperating flanges 34, 36. The opposite (proximal) ends of the walls 26 and 28 are spaced from each other to provide the chamber 32 with an open proximal end 58 which is also of substantially semi-circular configuration, and said open end 58 of the hood section 22 is situated in a plane which is substantially'at right angles to the bottom wall 34-36.

The outer wall 28 of the fixed section 22 is provided with a rearwardly directed tubular extension 38 as well as with reinforcing ribs 40 extending between the exterior surface of the wall 28 and the end of the tubular extension 38. The duct 18 is received in the tubular extension 38 and fixed thereto by screws 42, so that in this way the quadrispheroidal chamber 32 will receive the drying medium from the duct 18 which is of rectangular cross section, as shown in FIG. 5.

The movable hood section 24 has an inner wall 44 (see FIGS. '2 and 4) and an imperforate outer wall 46. The inner wall 44 is formed with a multitude of small apertures 48. The walls 44 and 46 define between themselves a quadrispheroidal chamber 50 for the mildly heated gaseous hair-drying medium. The bottom and distal end edges of the inner wall 44 terminate in an outwardly directed flange 52 which is of semicircular configuration, and the outer wall 46 has a correspondingly positioned inwardly directed flange 54 to which the flange 52 is connected, as by being welded thereto through ultrasonic welding, for example. Thus, the movable hood section 24 has -a bottom and distal end wall 52-54. The proximal ends of the walls 46 and 48 extending from the bottom wall 52-54 are spaced from each other to provide for the movable hood section 24 a proximal open end 56 which is telescopically received within the proximal open end 58 of the fixed section 22. The open end 56 of the movable section 24 is also of a substantially semicircular configuration and is situated in a plane which is substantially at right angles to the plane of the bottom wall 52-54.

A pivot means connects the movable section 24 to the fixed section 22 for turning movement with respect thereto about a horizontal axis which coincides with the axis of revolution of the quadrispherical parts which are formed by the sections 22 and 24, respectively. For this purpose (FIG. 4) the inner wall 44 of the movable section 24 is formed with a pair of tubular, open-ended axially aligned sleeves 60a and 60b respectively coincident with the aforesaid axis of revolution and extending from the inner wall 44 to the outer wall 46. These sleeves 60a and 60b terminate in end portions of reduced diameter received in openings which pass through the outer wall 46. These latter opening are respectively surrounded by bosses 62a and 62b of the outer wall 46 which respectively terminate in end faces rotatably engaging the inner surface of the outer wall 28 of the fixed hood section 22, so that these bosses 62a and 62b provide for bearing and wear surfaces between the hood sections.

In a similar manner, the inner wall 26 of the fixed hood section 22 is formed with a pair of circular bosses 64a and 64b respectively terminating in outer end faces rotatably engaging the inner wall 44 of the movable hood section 24 to provide wear and bearing surfaces for the movable section 24. These bosses 64a and 64b are coaxial with the bosses 62a and 62b and extend around coaxial openings of the inner wall 26. The outer wall 28 of the fixed section 22 is formed with a pair of additional coaxial openings through which a pair of pivot assemblies 66a and 66b of the pivot means respectively extend.

The pivot assemblies 66a and 66b, which have a common pivot axis coincident with the aforesaid axis of revolution, respectively include outer knurled knobs 68a and 68b situated at the ends of shanks 70a and 70b, the inner ends of which fixedly carry threaded studs 72a and 72b respectively received in threaded bores of a pair of inner, headed nut members 74a and 74b. Thus, by turning the knobs 68a and 68b it is possible to regulate the frictional engagement of the movable section 24 with respect to the fixed section 22 in the region of the pivot means so that the movable section will be frictionally held at any position to which it is turned in a manner described below.

The inner Walls 26 and 44 permanently overlap at least in part, and the outer Walls 22 and 46 also permanently overlap at least in part.

The bosses 62a, 62b maintain the outer walls 28, 46 slightly spaced apart; likewise the bosses 64a, 64b maintain the inner walls 26, 44 slightly spaced apart.

A sealing means is situated between the inner walls and between the outer walls so that the gaseous drying medium cannot escape from between the slightly spaced apart inner walls or from between the slightly spaced apart outer walls. In the illustrated example, the sealing means takes the form of an outer elastic foam tape 76 adhering to the inner surface of the outer wall 28 within the end 58 and slidably engaging the exterior surface of the outer wall 46 and a similar foam tape 78 adhering to the outer surface of the inner wall 26 within the end 58 and slidably engaging the exterior surface of the wall 44. These sealing tapes 76 and 78 extend along the entire lengths of the free edges of the walls 26 and 28 which define the open end 58 of the fixed section 22.

The movable section 24 is turnable with respect to the fixed section 22 up to the fully extended position shown in solid lines in FIG. 2, and in this position the free (proximal) ends of the wall 5254 respectively abut against the free ends of the wall 34-36 so as to limit the movement of the movable section 24 with respect to the stationary section 22. In this extended position of the movable section 24, the walls 34-36 and 5254 are located in a common horizontal plane, and the open end 56 of the movable section extends into the open end 58 of the fixed section 22 with the inner and outer walls of the movable section overlapping the inner and outer walls of the fixed section, respectively, to a minimum extent.

The movable section 24 has at its front lower region an outwardly directed extension 80 forming a handle integral with the outer wall 46 and connected thereto through reinforcing ribs 82. The person whose hair is being dried can at any time grasp that handle 80 and easily turn the movable section 24 in a clockwise direction, as viewed in FIG. 2, all the way to a fully retracted position where the end wall 52 assumes the position 52' in a substantially vertical plane which is substantially at right angles to the end wall 34. In this retracted position of the movable section 24 the inner and outer walls thereof respectively overlap the inner and outer walls of the fixed section to a maximum extent. The chamber 32 of the fixed section accommodates at the region of the end wall 34 an electric control switch 84 in the form of a suitable microswitch disposed to be engaged by an edge of the open end 58 of the movable section 24. The microswitch has normally closed contacts in the circuits for the blower motor and air-heating elements. Thus, when the movable section 24 is in the region of its fully retracted position an end edge portion of the movable section 24 will engage and actuate the switch 84 so as to turn the dryer oif automatically. In addition, retraction of the movable section to fully telescoped position is limited by an elastomeric bumper 85 supported on a flange 85 integral with and extending inwardly from the inner Wall 26. This bumper is engaged by an end edge portion of the movable section just after the switch 84 is actuated as aforesaid.

A closure means is provided for maintaining the chambers 32 and 5t closed on one another during a given increment of turning of the movable section 24 from its fully extended po ition toward its retracted position. This is necessary in the form of hood being described because the two sections 22, 24 are larger than quarter-spheres and the pivotal axis is above the bottoms of the sections which would otherwise become disengaged upon partial telescoping movement. The aforesaid closure means takes the form of a pair of arcuate mutually parallel shoes 86a and 86b which respectively form spaced extensions of the walls 52,

54 respectively extending from the corners of the walls 52, 54 which abut against the corners of the wall 34, in the extended position as shown in FIG. 2. These closure shoes 86a and 86b are joined by a wall 860 that extends along a cylinder whose axis coincides with the turning axis provided by the pivot means formed by the pair of pivot assemblies 66a and 66b. The foam tape 78 has a pair of free end portions 78a and 7812 (FIG. 4) extending across the wall 34 at the free end of the latter, and these sealing portions 78a and 78b have a sliding engagement with the exterior curved surfaces of the closure wall 860 while the shoes slidingly engage the tapes 76, 78.

The angular distance through which the closure shoes and wall 860 extend is approximately 45, so that it is possible to turn the movable section 24 through an angular increment of approximately 45 from its fully extended position toward its retracted position before the closure shoes 86a and 86b and wall 86c will be turned beyond the fixed section to open the proximal ends of both of the chambers 32 and 50 to the outer atmosphere. It has been found that this range of 45 of adjustability of the movable section in the region of its fully extended position is adequate to adpt the hood to different sizes of bodies of hair and brow lines, and to different styles of hair in order to limit the flow of the heating or drying medium through the apertures 30 and 48 to the hair only and not undesirably to other regions of the head of the patron whose hair is being dried. In this case also it is a simple matter for the persons whose hair is being dried, or the beauty parlor operator, to grasp the handle and to adjust the angular position of the movable section 24, within 45 range extending from the fully extended position toward the retrcted position of the movable section 24, in order to accommodate the hood of the invention to the required operating conditions.

While the above-described structure shown in FIGS. 1-5 is preferred because of the greater angular arc covered by the hood and for other reasons, it is also possible to provide variations in the structure such as, for example, the structure of FIG. 6. The hood of FIG. 6 also includes a fixed hood section 122 and a movable section 124, with the fixed hood section 122 communicating at its outer wall 128 with a supply duct 118 for the mildly heated drying medium. The fixed section 122 includes, in addition to its outer wall 128, an inner wall 126 formed with a multitude of small apertures 130 and defining with the wall 128 an inner chamber 132 which receives the drying medium from the duct 118. The inner wall 126 also terminates in a semi-circular end Wall 134 which may be welded, as by ultrasonic welding, to an outwardly directed flange 136 of the outer wall 128.

In a similar manner, the movable section 124 has an outer wall 146 and an inner wall 144, the latter wall being formed with a multitude of small apertures 148. The walls 144 and 146 define between themselves the chamber 150. The inner wall 144 terminates in a semicircular end wall 152 which is welded to the outwardly directed flange 154 of the outer wall 146. It will be noted that with the embodiment of FIG. 6 the inner and outer walls of the fixed hood section 122 are respectively situated outwardly of the inner and outer walls of the movable section 124.

At its open proximal end 158, the fixed section 122 has a pair of inwardly directed semi-circular flanges 176, while the movable section 124 has at its open proximal end 156 a pair of outwardly directed flanges 178 respectively extending from the walls 144 and 146 and interlocking with the flanges 176 to limit the turning of the movable section 124 to the extended position shown in FIG. 6. The flanges 178 are respectively provided with suitable coverings of sealing material forming a sealing means which has slidable engagement with the inner surfaces of the walls 126 and 128. The sealing means in this case turns with the movable section 124.

The pivot means of this embodiment includes, at each side of the hood, a hinge assembly 180 provided with a pair of hinge members 182 and 184 respectively fixed to the walls 152 and 134 in the manner illustrated in FIG. 6. The pivotally interconnected pairs of binge members 182 and 184 provide through their coaxial hinge pins 186 the turning axis for movement of the movable section 124 with respect to the fixed section 122. It will be noted that in this case the turning axis is situated directly at the region of the walls 134 and 152 and that the two sections are essentially true quarterspheres, so that a closure means need not be provided with this embodiment. In this embodiment also the walls 134 and 152 are coplanar in the fully extended position, and the walls of the movable section overlap the walls of the fixed section to a minimum extent. The operator can at any time grasp the wall 152 and swing the movable section in a clockwise direction, as viewed in FIG. 6, to its fully retracted position or to any desired position therebetween. The hinge assembly is tight enough to retain the movable section in any position to which it is swung and yet loose enough to enable it to be swung by the patron or operator.

In the fully extended position of the movable section 124 of FIG. 6, the plane in which the walls 134 and 152 are located is substantially a diametral plane of the sphere of which the hood sections respectively form quarter spheres, whereas with the embodiment of FIGS. 1-5, in the fully extended position of the movable section 24 the coplanar flanges 52 and 34 are situated in a plane which is parallel to but situated at a substantial distance below the diametral horizontal plane of the sphere which contains the turning axis of the movable section 24.

It is to be noted that with both embodiments of the invention the components which form the hood can be easily and inexpensively manufactured and assembled. The person whose hair is being dried can readily and conveniently place the hood in its retracted position where it is a simple matter for the person to move without any obstruction, by merely leaning or moving forwardly to and from the dryer. It no longer is necessary to have relative movement vertically between the head and the drier hood. Also, it is possible for the hood to have not only the fully extended position but also a range of positions in the region of its fully extended position where the hood is adapted to the particular requirements of the body of hair which is to be dried.

It thus will be seen that there are provided devices which achieve the several objects of the invention and which are well adapted to meet the conditions of practical use.

As various possible embodiments might be made of the above invention, and as various changes might be made in the embodiments above set forth, it is to be understood that all matter herein described or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

What is claimed is:

1. In a hair dryer, a hood having a fixed approximately quarter of revolution section and a movable approximately quarter of revolution section, each section havlng an apertured inner wall and an imperforate outer wall spaced therefrom to define therewith an approximately quarter of revolution chamber for receiving a gaseous drying medium, and said sections respectively having overlapping open proximal ends through which said chambers communicate with each other, said inner and outer walls of said movable section respectively being movable along said inner and outer walls of said fixed section between an extended position of said movable section, where said walls thereof overlap said walls of said fixed section to a minimum extent, and a retracted position, where said walls of said movable section overlap said walls of said fixed section to a maximum extent, and a supply duct operatively connected with the outer wall of one of said sections for blowing said drying medium to said chamber of said one section to flow from the latter chamber into the chamber of the other section and out through said apertures of said inner walls of said sections, said movable section, when in its extended position, providing for said hood a configuration substantially surrounding a body of hair which is to be dried and said movable section, when in its retracted position, providing for said hood a configuration giving substantially unobstructed front-to-back movement of the body of hair to and from the hood.

2. The combination of claim 1 and wherein said duct is connected with and carries said fixed section while said fixed section carries said movable section.

3. The combination of claim 1 and wherein a blower control switch carried by said fixed section is situated in the path of movement of said movable section to be engaged by the latter when in the region of its retracted position so as to stop blowing of the gaseous medium in such retracted position.

4. The combination of claim 1 and wherein a sealing means is located between said inner walls of said sections and between said outer walls of said sections for preventing the escape of the gaseous drying medium from betvlveen said inner walls and from between said outer wal s.

5. The combination of claim 1 and wherein said hood sections respectively have substantially the configurations of parts of a sphere. I

6. The combination of claim 5 and wherein said parts of said sphere are approximately equal to a quarter of a sphere.

7. The combination of claim 6 and wherein said movable section when in its extended position provides with said fixed section substantially the configuration of a hemisphere with a downwardly facing opening while in its retracted positions said movable section provides with said fixed section substantially the configuration of a quarter sphere with a forwardly and downwardly facing opening.

8. The combination of claim 5 and wherein a pivot means connects said movable section to said fixed section for turning movement with respect thereto about an axis coinciding at least approximately with a diameter of the sphere.

9. The combination of claim 8 and wherein said axis extends substantially horizontally and said movable section is raised to its retracted position and lowered to its extended position.

10. The combination of claim 1 and wherein said inner and outer walls of said fixed section are respectively located outwardly of said inner and outer walls of said movable section.

11. The combination of claim 1 and wherein said inner and outer walls of said movable section are located between said inner and outer walls of said fixed section.

12. The combination of claim 5 and wherein a closure means coacts with said hood sections for maintaining said open proximal ends thereof closed during movement of said movable section through a predetermined range of movement from its extended position toward its retracted position.

13. The combination of claim 8 and wherein a closure means coacts with said hood sections for maintaining said open proximal ends thereof closed during a given increment of turning of said movable section from its extended position toward its retracted position about said axis.

14. The combination of claim 13 and wherein said increment is approximately 45 of turning of said movable section from said extended position toward said retracted position thereof.

15. The combination of claim 13 and wherein said closure means includes a pair of arcuate shoes extending from said movable section into said fixed section when said movable section is in its extended position and only being displaced from said fixed section after said movable section has been turned through said increment, and shoes being connected by an arcuate wall, said shoes and wall being concentric about the pivot means.

16. The combination of claim 8 and wherein said hood sections respectively have end walls extending angularly from said overlapping open proximal ends, respectively, located in a common plane when said movable section is in said extended position thereof, and respectively located in different planes when said movable section is in said retracted position thereof.

17. The combination of claim 16 and wherein said end walls are respectively situated in planes which are substantially at right angles to planes where said open proximal ends of said hood sections are respectively located, said end wall of said movable section being located in a plane substantially parallel to the plane of said open end of said fixed section when said movable section is in said retracted position thereof.

18. The combination of claim 8 and wherein one of said sections has a pair of aligned diametrically opposed coaxial sleeves each having opposed open ends, and said sleeves extending between the inner and outer walls of the other section, said pivot means including a pair of pivot assemblies respectively extending through said sleeves, and said walls of said other section being respectively formed with openings aligned with said sleeves and through which said pivot assemblies extend to the interior and exterior of the hood.

19. The combination of claim 18 and wherein each pivot assembly includes an inner threaded member extending from the interior of said one section into said sleeves and said pair of pivot assemblies respectively including a pair of outer threaded members threaded with said inner members and extending from the exterior of the other section into said sleeves.

20. The combination of claim 19 and wherein said outer members of said pair of pivot assemblies respectively have manually engageable exterior knobs for turning said outer members with respect to said inner members to adjust the frictional coaction between said sections.

21. The combination of claim 18 and wherein one of said inner walls is provided with a pair of annular bosses surrounding said pivot assemblies, respectively, and terminating in end faces engaging the other of said inner walls to provide for bearing and Wear surfaces between said inner walls, while one of said outer walls is also formed with a pair of annular bosses surrounding said pivot assemblies, respectively, and terminating respectively in end faces engaging the other of said outer walls to provide additional bearing and Wear surfaces for said sections, said bosses providing spacing between the inner walls of each section and the outer walls of each section, and sealing means to inhibit escape of the drying medium through said spacing.

22. The combination of claim 16 and wherein said end walls of said movable and fixed sections are located, when said movable section is in its extended position, in a common plane situated at a substantial distance beyond the turning axis of said movable section.

References Cited UNITED STATES PATENTS 2,810,967 10/1957 Jacobs. 3,313,037 4/1967 Ullman.

FOREIGN PATENTS 784,311 4/1935 France. 472,813 6/ 1929 Germany. 1,007,966 5/1957 Germany.

FREDERICK L. MATTESON, 111., Primary Examiner H. B. RAMEY, Assistant Examiner 

